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File:sparkplug.jpg|right|thumb|Spark plug with single side electrodeA '''spark plug''' (sometimes, in British English, a '''sparking plug''',The Bosch book of the Motor Car, Its evolution and engineering development, St. Martin's Press, copyright 1975, Library of Congress # 75-39516, pp 206–207. and, colloquially, a '''plug''') is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine. A spark plug has a metal Screw thread|threaded shell, electrically isolated from a central electrode by a porcelain insulator. The central electrode, which may contain a resistor, is connected by a heavily Insulator (electricity)|insulated wire to the output terminal of an ignition coil or ignition magneto|magneto. The...
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